Highest temperature in London on July 16?

Platform comparison

Market context

London City Airport will record its peak temperature for 16 July 2026, with the market resolving to the specific Celsius range containing that high. Today’s actual reading sits at 20°C with a high of 28°C already logged, yet the crowd-implied probability for a “YES” outcome on any specific range remains at 0%, suggesting traders expect the final figure to fall outside the currently listed options or that the market structure itself is misaligned with the event’s resolution mechanics.

Historical July highs at EGLC typically cluster between 24°C and 31°C, with 28°C appearing as the frontrunner at 54% probability on Polymarket, while 29°C holds 30% [1]. This divergence highlights a key platform difference: Polymarket displays decimal odds and implied probabilities directly, whereas Kalshi uses binary contracts with fixed payouts and Smarkets/Betfair rely on traditional decimal odds. Fee structures also vary—Polymarket charges no maker fees but includes a small resolution fee, while Kalshi imposes a 1% cap on winnings and Smarkets offers low commission rates but requires KYC for larger trades.

Traders should monitor the official Wunderground daily history for EGLC once the settlement window closes at 12:00 UTC on 16 July 2026, as this is the sole resolution source. No weather announcements or forecasts will alter the outcome, but discrepancies between real-time readings (like today’s 28°C high [3]) and the final recorded value could signal data latency or station-specific anomalies. The 0% YES probability likely reflects a structural mismatch rather than a genuine belief in extreme cold, underscoring why platform choice matters when comparing odds formats and settlement clarity.

Sources: 1 · 2 · 3

Methodology

This page compares Highest temperature in London on July 16? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.